330 lines
16 KiB
JavaScript
330 lines
16 KiB
JavaScript
/**
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* @description MeshCentral MSTSC & SSH relay
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* @author Ylian Saint-Hilaire & Bryan Roe
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* @copyright Intel Corporation 2018-2021
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* @license Apache-2.0
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* @version v0.0.1
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*/
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/*jslint node: true */
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/*jshint node: true */
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/*jshint strict:false */
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/*jshint -W097 */
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/*jshint esversion: 6 */
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"use strict";
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// Construct a MSTSC Relay object, called upon connection
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// This is a bit of a hack as we are going to run the RDP connection thru a loopback connection.
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// If the "node-rdpjs-2" module supported passing a socket, we would do something different.
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module.exports.CreateMstscRelay = function (parent, db, ws, req, args, domain) {
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const Net = require('net');
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const WebSocket = require('ws');
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var obj = {};
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obj.ws = ws;
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obj.tcpServerPort = 0;
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obj.relayActive = false;
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var rdpClient = null;
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parent.parent.debug('relay', 'RDP: Request for RDP relay (' + req.clientIp + ')');
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// Disconnect
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obj.close = function (arg) {
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if (obj.ws == null) return;
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// Collect how many raw bytes where received and sent.
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// We sum both the websocket and TCP client in this case.
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//var inTraffc = obj.ws._socket.bytesRead, outTraffc = obj.ws._socket.bytesWritten;
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//if (obj.wsClient != null) { inTraffc += obj.wsClient._socket.bytesRead; outTraffc += obj.wsClient._socket.bytesWritten; }
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//console.log('WinRDP - in', inTraffc, 'out', outTraffc);
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if (obj.wsClient) { obj.wsClient.close(); delete obj.wsClient; }
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if (obj.tcpServer) { obj.tcpServer.close(); obj.tcpServer.destroy(); delete obj.tcpServer; }
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if (rdpClient) { rdpClient.close(); rdpClient = null; }
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if ((arg == 1) || (arg == null)) { try { ws.close(); } catch (e) { console.log(e); } } // Soft close, close the websocket
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if (arg == 2) { try { ws._socket._parent.end(); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
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obj.ws.removeAllListeners();
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obj.relayActive = false;
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delete obj.ws;
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};
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// Start the looppback server
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function startTcpServer() {
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obj.tcpServer = new Net.Server();
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obj.tcpServer.listen(0, '127.0.0.1', function () { obj.tcpServerPort = obj.tcpServer.address().port; startRdp(obj.tcpServerPort); });
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obj.tcpServer.on('connection', function (socket) {
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if (obj.relaySocket != null) {
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socket.close();
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} else {
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obj.relaySocket = socket;
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obj.relaySocket.pause();
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obj.relaySocket.on('data', function (chunk) { // Make sure to handle flow control.
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if (obj.relayActive == true) { obj.relaySocket.pause(); obj.wsClient.send(chunk, function () { obj.relaySocket.resume(); }); }
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});
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obj.relaySocket.on('end', function () { obj.close(); });
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obj.relaySocket.on('error', function (err) { obj.close(); });
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// Decode the authentication cookie
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var cookie = parent.parent.decodeCookie(obj.infos.ip, parent.parent.loginCookieEncryptionKey);
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if (cookie == null) return;
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// Setup the correct URL with domain and use TLS only if needed.
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var options = { rejectUnauthorized: false };
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if (domain.dns != null) { options.servername = domain.dns; }
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var protocol = (args.tlsoffload) ? 'ws' : 'wss';
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var domainadd = '';
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if ((domain.dns == null) && (domain.id != '')) { domainadd = domain.id + '/' }
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var url = protocol + '://127.0.0.1:' + args.port + '/' + domainadd + ((cookie.lc == 1) ? 'local' : 'mesh') + 'relay.ashx?noping=1&p=10&auth=' + obj.infos.ip; // Protocol 10 is Web-RDP
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parent.parent.debug('relay', 'RDP: Connection websocket to ' + url);
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obj.wsClient = new WebSocket(url, options);
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obj.wsClient.on('open', function () { parent.parent.debug('relay', 'RDP: Relay websocket open'); });
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obj.wsClient.on('message', function (data) { // Make sure to handle flow control.
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if ((obj.relayActive == false) && (data == 'c')) {
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obj.relayActive = true; obj.relaySocket.resume();
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} else {
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obj.wsClient._socket.pause();
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obj.relaySocket.write(data, function () { obj.wsClient._socket.resume(); });
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}
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});
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obj.wsClient.on('close', function () { parent.parent.debug('relay', 'RDP: Relay websocket closed'); obj.close(); });
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obj.wsClient.on('error', function (err) { parent.parent.debug('relay', 'RDP: Relay websocket error: ' + err); obj.close(); });
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obj.tcpServer.close();
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obj.tcpServer = null;
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}
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});
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}
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// Start the RDP client
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function startRdp(port) {
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parent.parent.debug('relay', 'RDP: Starting RDP client on loopback port ' + port);
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try {
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rdpClient = require('node-rdpjs-2').createClient({
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logLevel: 'ERROR',
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domain: obj.infos.domain,
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userName: obj.infos.username,
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password: obj.infos.password,
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enablePerf: true,
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autoLogin: true,
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screen: obj.infos.screen,
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locale: obj.infos.locale
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}).on('connect', function () {
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send(['rdp-connect']);
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}).on('bitmap', function (bitmap) {
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try { ws.send(bitmap.data); } catch (ex) { } // Send the bitmap data as binary
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delete bitmap.data;
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send(['rdp-bitmap', bitmap]); // Send the bitmap metadata seperately, without bitmap data.
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}).on('close', function () {
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send(['rdp-close']);
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}).on('error', function (err) {
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send(['rdp-error', err]);
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}).connect('127.0.0.1', obj.tcpServerPort);
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} catch (ex) {
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console.log('startRdpException', ex);
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obj.close();
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}
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}
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// When data is received from the web socket
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// RDP default port is 3389
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ws.on('message', function (msg) {
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try {
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msg = JSON.parse(msg);
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switch (msg[0]) {
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case 'infos': { obj.infos = msg[1]; startTcpServer(); break; }
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case 'mouse': { if (rdpClient) { rdpClient.sendPointerEvent(msg[1], msg[2], msg[3], msg[4]); } break; }
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case 'wheel': { if (rdpClient) { rdpClient.sendWheelEvent(msg[1], msg[2], msg[3], msg[4]); } break; }
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case 'scancode': { if (rdpClient) { rdpClient.sendKeyEventScancode(msg[1], msg[2]); } break; }
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case 'unicode': { if (rdpClient) { rdpClient.sendKeyEventUnicode(msg[1], msg[2]); } break; }
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case 'disconnect': { obj.close(); break; }
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}
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} catch (ex) {
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console.log('RdpMessageException', msg, ex);
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obj.close();
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}
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});
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// If error, do nothing
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ws.on('error', function (err) { parent.parent.debug('relay', 'RDP: Browser websocket error: ' + err); obj.close(); });
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// If the web socket is closed
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ws.on('close', function (req) { parent.parent.debug('relay', 'RDP: Browser websocket closed'); obj.close(); });
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// Send an object with flow control
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function send(obj) {
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try { rdpClient.bufferLayer.socket.pause(); } catch (ex) { }
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try { ws.send(JSON.stringify(obj), function () { try { rdpClient.bufferLayer.socket.resume(); } catch (ex) { } }); } catch (ex) { }
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}
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// We are all set, start receiving data
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ws._socket.resume();
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return obj;
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};
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// Construct a SSH Relay object, called upon connection
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module.exports.CreateSshRelay = function (parent, db, ws, req, args, domain) {
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const Net = require('net');
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const WebSocket = require('ws');
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// SerialTunnel object is used to embed SSH within another connection.
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function SerialTunnel(options) {
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var obj = new require('stream').Duplex(options);
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obj.forwardwrite = null;
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obj.updateBuffer = function (chunk) { this.push(chunk); };
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obj._write = function (chunk, encoding, callback) { if (obj.forwardwrite != null) { obj.forwardwrite(chunk); } if (callback) callback(); }; // Pass data written to forward
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obj._read = function (size) { }; // Push nothing, anything to read should be pushed from updateBuffer()
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obj.destroy = function () { delete obj.forwardwrite; }
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return obj;
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}
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const obj = {};
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obj.ws = ws;
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obj.relayActive = false;
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parent.parent.debug('relay', 'SSH: Request for SSH relay (' + req.clientIp + ')');
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// Disconnect
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obj.close = function (arg) {
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if (obj.ws == null) return;
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// Collect how many raw bytes where received and sent.
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// We sum both the websocket and TCP client in this case.
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//var inTraffc = obj.ws._socket.bytesRead, outTraffc = obj.ws._socket.bytesWritten;
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//if (obj.wsClient != null) { inTraffc += obj.wsClient._socket.bytesRead; outTraffc += obj.wsClient._socket.bytesWritten; }
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//console.log('WinSSH - in', inTraffc, 'out', outTraffc);
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if (obj.sshShell) {
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obj.sshShell.destroy();
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obj.sshShell.removeAllListeners('data');
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obj.sshShell.removeAllListeners('close');
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try { obj.sshShell.end(); } catch (ex) { console.log(ex); }
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delete obj.sshShell;
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}
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if (obj.sshClient) {
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obj.sshClient.destroy();
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obj.sshClient.removeAllListeners('ready');
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try { obj.sshClient.end(); } catch (ex) { console.log(ex); }
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delete obj.sshClient;
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}
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if (obj.wsClient) {
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obj.wsClient.removeAllListeners('open');
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obj.wsClient.removeAllListeners('message');
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obj.wsClient.removeAllListeners('close');
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try { obj.wsClient.close(); } catch (ex) { console.log(ex); }
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delete obj.wsClient;
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}
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if ((arg == 1) || (arg == null)) { try { ws.close(); } catch (e) { console.log(e); } } // Soft close, close the websocket
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if (arg == 2) { try { ws._socket._parent.end(); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
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obj.ws.removeAllListeners();
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obj.relayActive = false;
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delete obj.termSize;
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delete obj.cookie;
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delete obj.ws;
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};
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// Decode the authentication cookie
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obj.cookie = parent.parent.decodeCookie(req.query.auth, parent.parent.loginCookieEncryptionKey);
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if (obj.cookie == null) { obj.ws.send(JSON.stringify({ action: 'sessionerror' })); obj.close(); return; }
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// Start the looppback server
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function startRelayConnection() {
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try {
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// Setup the correct URL with domain and use TLS only if needed.
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var options = { rejectUnauthorized: false };
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if (domain.dns != null) { options.servername = domain.dns; }
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var protocol = 'wss';
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if (args.tlsoffload) { protocol = 'ws'; }
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var domainadd = '';
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if ((domain.dns == null) && (domain.id != '')) { domainadd = domain.id + '/' }
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var url = protocol + '://127.0.0.1:' + args.port + '/' + domainadd + ((obj.cookie.lc == 1) ? 'local' : 'mesh') + 'relay.ashx?noping=1&p=11&auth=' + req.query.auth; // Protocol 11 is Web-SSH
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parent.parent.debug('relay', 'SSH: Connection websocket to ' + url);
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obj.wsClient = new WebSocket(url, options);
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obj.wsClient.on('open', function () { parent.parent.debug('relay', 'SSH: Relay websocket open'); });
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obj.wsClient.on('message', function (data) { // Make sure to handle flow control.
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if ((obj.relayActive == false) && (data == 'c')) {
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obj.relayActive = true;
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// Create a serial tunnel && SSH module
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obj.ser = new SerialTunnel();
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const Client = require('ssh2').Client;
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obj.sshClient = new Client();
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obj.sshClient.on('ready', function () { // Authentication was successful.
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obj.sshClient.shell(function (err, stream) { // Start a remote shell
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if (err) { obj.close(); return; }
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obj.sshShell = stream;
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obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width);
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obj.sshShell.on('close', function () { obj.close(); });
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obj.sshShell.on('data', function (data) { obj.ws.send('~' + data); });
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});
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obj.ws.send(JSON.stringify({ action: 'connected' }));
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});
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obj.sshClient.on('error', function (err) {
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if (err.level == 'client-authentication') { obj.ws.send(JSON.stringify({ action: 'autherror' })); }
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obj.close();
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});
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// Setup the serial tunnel, SSH ---> Relay WS
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obj.ser.forwardwrite = function (data) { if ((data.length > 0) && (obj.wsClient != null)) { try { obj.wsClient.send(data); } catch (ex) { } } };
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// Connect the SSH module to the serial tunnel
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var connectionOptions = { sock: obj.ser }
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if (typeof obj.username == 'string') { connectionOptions.username = obj.username; delete obj.username; }
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if (typeof obj.password == 'string') { connectionOptions.password = obj.password; delete obj.password; }
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obj.sshClient.connect(connectionOptions);
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// We are all set, start receiving data
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ws._socket.resume();
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} else {
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// Relay WS --> SSH
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if ((data.length > 0) && (obj.ser != null)) { try { obj.ser.updateBuffer(data); } catch (ex) { console.log(ex); } }
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}
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});
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obj.wsClient.on('close', function () { parent.parent.debug('relay', 'SSH: Relay websocket closed'); obj.close(); });
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obj.wsClient.on('error', function (err) { parent.parent.debug('relay', 'SSH: Relay websocket error: ' + err); obj.close(); });
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} catch (ex) {
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console.log(ex);
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}
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}
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// When data is received from the web socket
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// SSH default port is 22
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ws.on('message', function (msg) {
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try {
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if (typeof msg != 'string') return;
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if (msg[0] == '{') {
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// Control data
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msg = JSON.parse(msg);
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if (typeof msg.action != 'string') return;
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switch (msg.action) {
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case 'connect': {
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obj.termSize = msg;
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obj.username = msg.username;
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obj.password = msg.password;
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startRelayConnection();
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break;
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}
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case 'resize': {
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obj.termSize = msg;
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if (obj.sshShell != null) { obj.sshShell.setWindow(obj.termSize.rows, obj.termSize.cols, obj.termSize.height, obj.termSize.width); }
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break;
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}
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}
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} else if (msg[0] == '~') {
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// Terminal data
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if (obj.sshShell != null) { obj.sshShell.write(msg.substring(1)); }
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}
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} catch (ex) { obj.close(); }
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});
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// If error, do nothing
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ws.on('error', function (err) { parent.parent.debug('relay', 'SSH: Browser websocket error: ' + err); obj.close(); });
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// If the web socket is closed
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ws.on('close', function (req) { parent.parent.debug('relay', 'SSH: Browser websocket closed'); obj.close(); });
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return obj;
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}; |